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- 저자 : Katbeh, Mary (검색결과 1 건)
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Yoon, Sun Hee,ElShorafa, Rand,Katbeh, Mary,Han, Dong Suk,Jeong, Hye Won,Park, Hyunwoong,Abdel-Wahab, Ahmed Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.423 No.-
<P><B>Abstract</B></P> <P>This study investigated the effect of TiO<SUB>2</SUB> morphology-driven intrinsic oxygen defects on photocatalytic activities for removal of Cr(VI). To do so, two different-shaped TiO<SUB>2</SUB> particles, nano-granular TiO<SUB>2</SUB> particles (TiNP) and TiO<SUB>2</SUB> nanotube particles (TiNT), were prepared and applied. The surface analyses indicated that TiNP was found to have a greater photocatalytic activity than TiNT because of its more crystallinity and lower bandgap energy, more oxygen vacancies closer to the conduction band (CB), and its resulting more amounts of photogenerated electrons. Accordingly, these photocatalytic properties of TiO<SUB>2</SUB> particles were more evident in experimental result for photocatalytic reduction of Cr(VI) that was tested as a model target compound. The batch system showed that TiNP completely reduced Cr(VI) to Cr(III) at acidic and neutral pH, whereas TiNT were less effective even at low pH.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Different-shaped TiO<SUB>2</SUB> particles (granular (TiNP) and tubular (TiNT)) were applied. </LI> <LI> Relatively more intrinsic oxygen defect sites in TiNP, whereas more interstitial oxygen in TiNT. </LI> <LI> Relatively rapid reduction of Cr(VI) by TiNP due to facile electron transfer through oxygen defect sites. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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